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armv8-r/r52: add neon support into compiler line

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1. correct the armv8-r fpu flag from vfpv3-d16 to fpv5-sp-d16
2. add neon support

This commit updates the build script to specify the FPU type of
`fpv5-sp-d16` when the processor is configured with a single-precision
FPU, and `neon-fp-armv8` when the processor is configured with a
double-precision + Advanced SIMD-capable FPU.

Note that the `fp-armv8` FPU type is an alias for double-precision FPv5
with 32 double-precision registers (refer to the GCC
`gcc/config/arm/arm-cpus.in` for more details); NEON is always
specified in case of a double-precision configuration because the
Cortex-R52 can only be configured as such.

Reference:
https://developer.arm.com/Processors/Cortex-R52

Instruction set:

Arm and Thumb-2. Supports DSP instructions and a configurable Floating-Point
Unit either with single-precision or double precision and Neon.

Signed-off-by: chao an <anchao@lixiang.com>
This commit is contained in:
chao an 2024-09-03 10:22:43 +08:00 committed by Alan C. Assis
parent a65adcd9db
commit dedb4c95c9
2 changed files with 13 additions and 2 deletions
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8
arch/arm/src/armv8-r/Toolchain.defs
View File

@ -22,12 +22,18 @@ ARCHCPUFLAGS += -march=armv8-r
ifeq ($(CONFIG_ARCH_FPU),y)
LLVM_ABITYPE := eabihf
ARCHCPUFLAGS += -mfpu=vfpv3-d16
ifeq ($(CONFIG_ARCH_CORTEXR52)$(CONFIG_ARM_NEON),yy)
ARCHCPUFLAGS += -mfpu=neon-fp-armv8
else
ARCHCPUFLAGS += -mfpu=fpv5-sp-d16
endif
ifeq ($(CONFIG_ARM_FPU_ABI_SOFT),y)
ARCHCPUFLAGS += -mfloat-abi=softfp
else
ARCHCPUFLAGS += -mfloat-abi=hard
endif
else
LLVM_ABITYPE := eabi
ARCHCPUFLAGS += -mfloat-abi=soft

7
arch/arm/src/cmake/armv8-r.cmake
View File

@ -25,7 +25,12 @@ if(CONFIG_ARCH_CORTEXR52)
endif()
if(CONFIG_ARCH_FPU)
list(APPEND PLATFORM_FLAGS -mfpu=vfpv3-d16)
if(CONFIG_ARCH_CORTEXR52 AND CONFIG_ARM_NEON)
list(APPEND PLATFORM_FLAGS -mfpu=neon-fp-armv8)
else()
list(APPEND PLATFORM_FLAGS -mfpu=fpv5-sp-d16)
endif()
if(CONFIG_ARM_FPU_ABI_SOFT)
list(APPEND PLATFORM_FLAGS -mfloat-abi=softfp)
else()